Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0f8e907b1b1c0c…

MALICIOUS

PDF

167.7 KB Created: 2021-09-18 08:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08a93e3a78c8b56da6140116790f3eb5 SHA-1: 5d702adb585c7206a83ac32ccc0560944f8001ec SHA-256: ec0f8e907b1b1c0ceb1c165f27b1193133d49ebd91f1c455071eb1ecc36edeb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of multiple external URIs and link farms points towards an attempt to leverage compromised infrastructure for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef3b065047---84770519229.pdf
    • http://maszyny.pl/userfiles/file/78979150456.pdf
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61068944696.pdf
    • http://cgl.lu/userfiles/files/lilidom.pdf
    • http://nhuaduongnhapkhauaz.org/upload/files/zijulobutizazan.pdf
    • https://www.idd.no/ckfinder/userfiles/files/ganobopewozuxaligipedili.pdf
    • http://allycatering.com/userfiles/vatovabugagizoxe.pdf
    • https://commonlawhouse.in/userfiles/file/ginoxisofu.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8bd6aa60---fetepelikopu.pdf
    • https://apluskleaning.com/admin/images/file/tupomotowazisaw.pdf
    • https://hojoairport.com/images/file/30241884358.pdf
    • http://devison-matras.com/upload/file/25630931027.pdf
    • https://cardion.dk/gfx/fckimages/file/82323923587.pdf
    • http://sterenstein.ru/userfiles/file/1154218662.pdf
    • https://gilbertems.com/videos/file/jeligagu.pdf
    • http://sbnjl.com/userfiles/files/73872167357.pdf
    • http://wyadonline.com/userfiles/file/44215168207.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/39166968291.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0bbabecb5---donamamexabavokoroju.pdf
    • https://twr1115.net/files/fckeditor/file/76316200873.pdf
    • http://jewelry-shopping-city.com/uploads/files/202109032337512829.pdf
    • http://protectakoteasia.com/ckfinder/userfiles/files/nolunusunadogasuremep.pdf
    • http://acecaalcoy.com/userfiles/file/2964563317.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+auto+tweaks
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022be1.bin
bd7670b01217133d653e970da41789546436393e34ab51ef1043569c0626484b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22BE1 20112 bytes
font_01_sfnt_off000260c5.bin
74238218bcea3f218074ff49076afb1ab2449439bd6b3f23366296f4fdee9ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x260C5 10452 bytes
font_02_sfnt_off000278bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x278BC 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.